Power supply control method and device of vehicle, controller, vehicle, medium and product

Abstract

This invention relates to a power supply control method, device, controller, vehicle, medium, and product for a vehicle. In this method, the predicted output power and thermal derating probability of each DC-DC converter are calculated based on the obtained operating parameters of the DC-DC converters in each power supply branch. Furthermore, if the predicted output power of at least one DC-DC converter is less than its load power, a target power for each DC-DC converter is calculated based on its predicted output power, thermal derating probability, preset priority factor, and load power. Finally, the operation of the DC-DC converters is controlled according to their target power. This solution improves the safety of DC-DC converters by predicting when they are about to malfunction and readjusting their power.

Description

Technical Field

[0001] This invention relates to the field of vehicle technology, and specifically to a power supply control method, device, controller, vehicle, medium, and product for a vehicle. Background Technology

[0002] With the development of automotive intelligence, the demand for 48V power supply systems from loads such as electronic control units, actuators, power management units, and air conditioning compressors has increased significantly. These loads typically require high-power, highly dynamic power supply support, and place higher demands on the reliability, efficiency, and lifespan balance of the power supply system. These loads are usually connected to different power supply branches, requiring control of the power supply to these branches to meet the load requirements.

[0003] In the existing technology, the way to control the power supply of different branches is usually to set the output power of the DC-DC converters in different power supply branches, and the DC-DC converters operate according to the set output power.

[0004] However, continuing to operate at the set output power when the DC-DC converter malfunctions will damage the DC-DC converter. Summary of the Invention

[0005] One objective of this invention is to provide a power supply control method for a vehicle to solve the problem in the prior art where a DC-DC converter continues to operate at the set output power when an abnormality occurs, causing damage to the DC-DC converter; a second objective is to provide a power supply control device for a vehicle; a third objective is to provide a controller; a fourth objective is to provide a vehicle; a fifth objective is to provide a readable storage medium; and a sixth objective is to provide a computer program product.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] In a first aspect, this application provides a power supply control method for a vehicle, applied to a controller in the vehicle, the method comprising:

[0008] Based on the operating parameters of the DC-DC converters in each power supply branch, calculate the predicted output power and thermal derating probability of each DC-DC converter;

[0009] If the predicted output power of at least one DC-DC converter is less than the load power of the DC-DC converter, then the target power of each DC-DC converter is calculated based on the predicted output power, thermal derating probability, preset priority factor and load power of each DC-DC converter.

[0010] For each DC-DC converter, the operation of the DC-DC converter is controlled according to the target power of the DC-DC converter.

[0011] Furthermore, the operating parameters of each DC-DC converter include: the current temperature, the current output power, and the temperature of a preset number of times prior to the current time;

[0012] The step of calculating the predicted output power and thermal derating probability of each DC-DC converter based on the obtained operating parameters of the DC-DC converters in each power supply branch includes:

[0013] The predicted temperature of each DC-DC converter is determined based on the current temperature of each DC-DC converter and the temperature of a preset number of times prior to the current temperature.

[0014] The predicted output power of each DC-DC converter is determined based on the preset temperature threshold, the predicted temperature of each DC-DC converter, the output power at the current moment, and the preset thermal derating curve.

[0015] The thermal derating probability of each DC-DC converter is determined based on the preset temperature threshold, the preset safe temperature, and the predicted temperature of each DC-DC converter, wherein the preset safe temperature is less than the preset temperature threshold.

[0016] Furthermore, determining the predicted output power of each DC-DC converter based on a preset temperature threshold, the predicted temperature of each DC-DC converter, the output power at the current moment, and a preset thermal derating curve includes:

[0017] For each DC-DC converter, if the predicted temperature of the DC-DC converter is less than or equal to the preset temperature threshold, then the current output power of the DC-DC converter is used as the predicted output power of the DC-DC converter.

[0018] For each DC-DC converter, if the predicted temperature of the DC-DC converter is greater than the preset temperature threshold, then the smaller value between the thermal derating power of the DC-DC converter and the output power at the current moment is taken as the predicted output power of the DC-DC converter; the thermal derating power of the DC-DC converter is the power corresponding to the predicted temperature of the DC-DC converter in the preset thermal derating curve.

[0019] Furthermore, determining the thermal derating probability of each DC-DC converter based on the preset temperature threshold, the preset safe temperature, and the predicted temperature of each DC-DC converter includes:

[0020] For each DC-DC converter, if the predicted temperature of the DC-DC converter is less than or equal to the preset safe temperature, then the thermal derating probability of the DC-DC converter is determined to be 0.

[0021] For each DC-DC converter, if the predicted temperature of the DC-DC converter is greater than or equal to the preset temperature threshold, then the thermal derating probability of the DC-DC converter is determined to be 1.

[0022] For each DC-DC converter, if the predicted temperature of the DC-DC converter is greater than the preset safe temperature and less than the preset temperature threshold, then the difference between the predicted temperature and the preset safe temperature of the DC-DC converter is divided by the difference between the preset temperature threshold and the preset safe temperature to obtain the thermal derating probability of the DC-DC converter.

[0023] Furthermore, the step of calculating the target power of each DC-DC converter based on its predicted output power, thermal derating probability, preset priority factor, and load power includes:

[0024] For each DC-DC converter, the power supply capability parameters of the DC-DC converter are calculated based on the predicted output power, thermal derating probability, and preset priority factor of the DC-DC converter.

[0025] The power supply capability parameters of each DC-DC converter are normalized to obtain the weight of each DC-DC converter;

[0026] The sum of the load power of all DC-DC converters is taken as the total load power;

[0027] For each DC-DC converter, the target power of the DC-DC converter is the product of the total load power and the weight of the DC-DC converter.

[0028] Furthermore, the step of calculating the power supply capability parameters of the DC-DC converter based on the predicted output power, thermal derating probability, and preset priority factor of the DC-DC converter includes:

[0029] The difference between 1 and the thermal derating probability of the DC-DC converter is used as the thermal derating correction factor of the DC-DC converter.

[0030] The product of the predicted output power, thermal derating correction factor, and preset priority factor of the DC-DC converter is used as the power supply capability parameter of the DC-DC converter.

[0031] Furthermore, controlling the operation of the DC-DC converter according to the target power of the DC-DC converter includes:

[0032] The operation of the DC-DC converter is controlled according to the preset current change rate and the target power of the DC-DC converter.

[0033] Furthermore, the method also includes:

[0034] When an abnormal power change is detected in at least one DC-DC converter, for each DC-DC converter, the operation of the DC-DC converter is controlled according to the current output power in the operating parameters of the DC-DC converter, and an alarm message is output.

[0035] Furthermore, the method also includes:

[0036] The DC-DC converter whose predicted output power is less than the load power is used as the target converter;

[0037] Reacquire the operating parameters of the DC-DC converter in each power supply branch;

[0038] The bus voltage deviation of each DC-DC converter is determined based on the operating parameters of each DC-DC converter and the reacquired operating parameters.

[0039] The temperature rise rate difference for each target converter is determined based on the operating parameters of each target converter and the reacquired operating parameters.

[0040] If the bus voltage deviation of a DC-DC converter is not within the preset deviation range, the temperature rise rate difference of the target converter is greater than 0, or the load in the power supply branch is detected to have reset or power failure, then based on the reacquired operating parameters of each DC-DC converter, the new predicted output power and new thermal derating probability of each DC-DC converter are calculated.

[0041] Calculate the new target power for each DC-DC converter based on the new predicted output power, new thermal derating probability, preset priority factor, and load power.

[0042] For each DC-DC converter, the operation of the DC-DC converter is controlled according to the new target power of the DC-DC converter;

[0043] Repeat the above steps until the bus voltage deviation of each DC-DC converter is within the preset deviation range, the temperature rise rate difference of each target converter is less than or equal to 0, and no load reset or power failure is detected in the power supply branch, then end the power supply control.

[0044] Secondly, this application provides a power supply control device for a vehicle, comprising:

[0045] Processing module, used for:

[0046] Based on the operating parameters of the DC-DC converters in each power supply branch, calculate the predicted output power and thermal derating probability of each DC-DC converter;

[0047] If the predicted output power of at least one DC-DC converter is less than the load power of the DC-DC converter, then the target power of each DC-DC converter is calculated based on the predicted output power, thermal derating probability, preset priority factor and load power of each DC-DC converter.

[0048] A control module is used to control the operation of each DC-DC converter according to the target power of the DC-DC converter.

[0049] Thirdly, this application provides a controller, including:

[0050] Processor, memory, communication interface;

[0051] The memory is used to store the executable instructions of the processor;

[0052] The processor is configured to execute the power supply control method for the vehicle according to any one of the first aspects by executing the executable instructions.

[0053] Fourthly, this application provides a vehicle including a controller and multiple power supply branches;

[0054] Each power supply branch includes a DC-DC converter;

[0055] The controller is used to execute the power supply control method for the vehicle as described in any of the first aspects above.

[0056] Fifthly, this application provides a readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the power supply control method for a vehicle as described in any of the first aspects.

[0057] In a sixth aspect, this application provides a computer program product, including a computer program that, when executed by a processor, is used to implement the power supply control method for a vehicle as described in any of the first aspects.

[0058] The beneficial effects of this invention are:

[0059] (1) This application calculates the predicted output power and thermal derating probability of each DC-DC converter based on the operating parameters of the DC-DC converters in each power supply branch; furthermore, if the predicted output power of at least one DC-DC converter is less than the load power of the DC-DC converter, the target power of each DC-DC converter is calculated based on the predicted output power, thermal derating probability, preset priority factor, and load power of each DC-DC converter; finally, the operation of the DC-DC converter is controlled based on the target power of the DC-DC converter. This solution readjusts the power of the DC-DC converter when the predicted output power of the DC-DC converter is less than the load power, that is, when it is predicted that the DC-DC converter is about to malfunction, so as to avoid damage to the DC-DC converter and improve the safety of the DC-DC converter.

[0060] (2) This application adjusts the power of the DC-DC converter by adjusting the load power, which can ensure that the loads connected to multiple power supply branches at the same time are adequately powered. Attached Figure Description

[0061] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0062] Figure 1 A schematic diagram illustrating an application scenario for the vehicle power supply control method provided in this application;

[0063] Figure 2 A flowchart illustrating an embodiment of the vehicle power supply control method provided in this application;

[0064] Figure 3 A flowchart illustrating Embodiment 2 of the vehicle power supply control method provided in this application;

[0065] Figure 4 A schematic diagram of the structure of an embodiment of the vehicle power supply control device provided in this application;

[0066] Figure 5 This is a schematic diagram of the structure of a controller provided in this application.

[0067] The accompanying drawings have illustrated specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to specific embodiments. Detailed Implementation

[0068] The embodiments of the present invention will be described below with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention and not for limiting the scope of protection of the present invention.

[0069] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0070] With the development of automotive intelligence, the demand for 48V power supply systems from loads such as electronic control units, actuators, power management units, and air conditioning compressors has increased significantly. These loads typically require high-power, highly dynamic power supply support, and place higher demands on the reliability, efficiency, and lifespan balance of the power supply system. These loads are usually connected to different power supply branches, requiring control of the power supply to these branches to meet the load requirements.

[0071] In existing technologies, the method for controlling the power supply to different branches typically involves setting the output power of the DC-DC converters in each power supply branch, and the DC-DC converters operate according to the set output power. However, if a DC-DC converter malfunctions, continuing to operate at the set output power can damage the DC-DC converter.

[0072] To address the problems existing in the prior art, the inventors, during their research on vehicle power supply control methods, discovered that DC-DC converters typically reduce their output power after overheating, resulting in thermal derating or insufficient power supply. Therefore, the inventors developed a method to predict whether a DC-DC converter is about to malfunction. Upon predicting an impending malfunction, the inventors adjust the power operation of the DC-DC converter, proactively adjusting the power and improving its safety. Based on the operating parameters of the DC-DC converters in each power supply branch, the inventors calculate the predicted output power and thermal derating probability of each converter. Furthermore, if the predicted output power of at least one DC-DC converter is less than the load power, the inventors calculate the target power for each DC-DC converter based on its predicted output power, thermal derating probability, preset priority factor, and load power. Finally, the inventors control the operation of the DC-DC converters based on their target power. Based on the above inventive concept, the vehicle power supply control scheme described in this application was designed.

[0073] The controller in this application can be a Central Power Management Unit (CPMU), a Vehicle Control Unit (VCU), a Zone Control Unit (ZCU), etc. This application does not limit it and can be determined according to the actual situation.

[0074] For example, Figure 1 This is a schematic diagram illustrating an application scenario of the vehicle power supply control method provided in this application, such as... Figure 1 As shown, the application scenario may include: controller 101, power battery 102 and multiple power supply branches (only three power supply branches are shown in the figure, namely the first power supply branch 103, the second power supply branch 104 and the third power supply branch 105).

[0075] exist Figure 1 In the application scenario shown, each power supply branch is electrically connected to the power battery 102. The first power supply branch 103 includes a first DC-DC converter 106, and the connected loads are a first load 107 and a second load 108. The second power supply branch 104 includes a second DC-DC converter 109, and the connected loads are a second load 108, a third load 110, a fourth load 111, and a fifth load 112. The third power supply branch 105 includes a third DC-DC converter 113, and the connected loads are a fifth load 112 and a sixth load 114. The controller 101 is communicatively connected to the first DC-DC converter 106, the second DC-DC converter 109, and the third DC-DC converter 113, respectively.

[0076] It should be noted that a load can be connected to one power supply branch or multiple power supply branches. The load can be an electronic control unit, actuator, power management unit, air conditioning compressor, battery, etc. This application embodiment does not limit the load and can be determined according to the actual situation.

[0077] The controller 101 calculates the predicted output power and thermal derating probability of each DC-DC converter based on the operating parameters of the DC-DC converters in each power supply branch.

[0078] The predicted output power of the first DC-DC converter 106 is less than its own load power. The controller 101 then calculates the target power of each DC-DC converter based on the predicted output power, thermal derating probability, preset priority factor and load power of each DC-DC converter.

[0079] For each DC-DC converter, the controller 101 controls the operation of the DC-DC converter according to the target power of the DC-DC converter.

[0080] It should be noted that, Figure 1 This is merely a schematic diagram illustrating one application scenario provided by an embodiment of this application. This embodiment does not necessarily represent... Figure 1 The document does not limit the actual form of the various devices included, nor does it specify the form of the devices. Figure 1 The interaction methods between devices are limited, and can be set according to actual needs in the specific application of the solution.

[0081] The technical solution of this application will now be described in detail through specific embodiments. It should be noted that the following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments.

[0082] Figure 2 This is a flowchart illustrating a first embodiment of the vehicle power supply control method provided in this application. The embodiment describes how the controller adjusts the output power of each DC-DC converter when it predicts an impending malfunction. The method in this embodiment can be implemented through software, hardware, or a combination of both. Figure 2 As shown, the power supply control method for this vehicle specifically includes the following steps:

[0083] S201: Based on the operating parameters of the DC-DC converters in each power supply branch, calculate the predicted output power and thermal derating probability of each DC-DC converter.

[0084] In this step, in order to determine whether the DC-DC converters in the power supply branch are about to malfunction and make adjustments in advance, the controller needs to obtain the operating parameters of the DC-DC converters in each power supply branch, and then calculate the predicted output power and thermal derating probability of each DC-DC converter based on the operating parameters of each DC-DC converter.

[0085] The operating parameters for each DC-DC converter include: the current temperature, the current output power, and the temperature at a preset number of previous times.

[0086] It should be noted that the preset quantity can be 2, 3, 5, etc. This application embodiment does not limit the preset quantity, and it can be determined according to the actual situation.

[0087] Specifically, the predicted temperature of each DC-DC converter is determined based on the current temperature of each DC-DC converter and the temperature of a preset number of times prior to the current temperature.

[0088] In other words, a linear fit is first performed based on the temperature at a preset number of moments prior to the current moment to obtain a fitted straight line. The slope of the fitted straight line is then used as the temperature rise rate. This temperature rise rate is then multiplied by a preset prediction duration to obtain the temperature difference. Finally, the current temperature is added to the temperature difference to obtain the predicted temperature of the DC-DC converter.

[0089] It should be noted that the preset prediction duration can be 8 seconds, 10 seconds, 15 seconds, etc. This application embodiment does not limit the preset prediction duration, which can be determined according to the actual situation.

[0090] After obtaining the predicted temperature, the predicted output power of each DC-DC converter is determined based on the preset temperature threshold, the predicted temperature of each DC-DC converter, the output power at the current moment, and the preset thermal derating curve.

[0091] In other words, for each DC-DC converter, if the predicted temperature of the DC-DC converter is less than or equal to the preset temperature threshold, it means that the DC-DC converter will basically not experience thermal derating. In this case, the current output power of the DC-DC converter is taken as the predicted output power of the DC-DC converter.

[0092] For each DC-DC converter, if the predicted temperature of the DC-DC converter is greater than the preset temperature threshold, it indicates that the DC-DC converter is about to experience thermal derating. The smaller value between the thermal derating power of the DC-DC converter and the current output power is taken as the predicted output power of the DC-DC converter. The thermal derating power of the DC-DC converter is the power corresponding to the predicted temperature of the DC-DC converter in the preset thermal derating curve.

[0093] It should be noted that the preset thermal derating curve is a power-temperature relationship curve; the higher the temperature, the lower the corresponding power. The preset temperature threshold is the temperature at which the DC-DC converter experiences thermal derating, and can be 110 degrees Celsius, 120 degrees Celsius, 130 degrees Celsius, etc. This application does not limit the preset thermal derating curve and preset temperature threshold; they can be determined according to actual conditions.

[0094] After obtaining the predicted temperature, the thermal derating probability of each DC-DC converter can be determined based on the preset temperature threshold, the preset safe temperature, and the predicted temperature of each DC-DC converter. The preset safe temperature is less than the preset temperature threshold.

[0095] In other words, for each DC-DC converter, if the predicted temperature of the DC-DC converter is less than or equal to the preset safe temperature, it means that the DC-DC converter will not experience thermal derating, and the thermal derating probability of the DC-DC converter is determined to be 0.

[0096] For each DC-DC converter, if the predicted temperature of the DC-DC converter is greater than or equal to the preset temperature threshold, it indicates that the DC-DC converter will experience thermal derating, and the thermal derating probability of the DC-DC converter is determined to be 1.

[0097] For each DC-DC converter, if the predicted temperature of the DC-DC converter is greater than the preset safe temperature but less than the preset temperature threshold, it indicates that the DC-DC converter may experience thermal derating. The probability of thermal derating for the DC-DC converter is obtained by dividing the difference between the predicted temperature and the preset safe temperature by the difference between the preset temperature threshold and the preset safe temperature. The closer the predicted temperature is to the preset temperature threshold, the greater the probability of thermal derating.

[0098] It should be noted that the preset safe temperature can be 70 degrees Celsius, 80 degrees Celsius, 90 degrees Celsius, etc. This application does not limit the preset safe temperature; it can be determined according to actual conditions.

[0099] S202: If the predicted output power of at least one DC-DC converter is less than its own load power, then calculate the target power of each DC-DC converter based on the predicted output power, thermal derating probability, preset priority factor and load power of each DC-DC converter.

[0100] In this step, after the controller determines the predicted output power of each DC-DC converter, in order to determine whether any DC-DC converter is about to malfunction, it determines that the predicted output power of each DC-DC converter is less than its own load power.

[0101] The load power of a DC-DC converter is the total rated power of all loads in the power supply branch where the DC-DC converter is located.

[0102] If the predicted output power of at least one DC-DC converter is less than its own load power, it indicates that a DC-DC converter is about to malfunction and its power needs to be adjusted. Then, the target power of each DC-DC converter is calculated based on its predicted output power, thermal derating probability, preset priority factor, and load power.

[0103] Specifically, for each DC-DC converter, the power supply capability parameter of the DC-DC converter is calculated based on the predicted output power, thermal derating probability, and preset priority factor. The power supply capability parameter is used to characterize the power supply capability of the DC-DC converter.

[0104] In other words, the difference between 1 and the thermal derating probability of the DC-DC converter is first used as the thermal derating correction factor of the DC-DC converter. Then, the product of the predicted output power of the DC-DC converter, the thermal derating correction factor, and the preset priority factor is used as the power supply capability parameter of the DC-DC converter.

[0105] After obtaining the power supply capability parameters, the power supply capability parameters of each DC-DC converter are normalized to obtain the weight of each DC-DC converter. That is, the sum of the power supply capability parameters of all DC-DC converters is taken as the total power supply capability parameter. Then, for each DC-DC converter, the power supply capability parameter of that DC-DC converter is divided by the total power supply capability parameter to obtain the weight of that DC-DC converter.

[0106] Then, the sum of the load power of all DC-DC converters is taken as the total load power. For each DC-DC converter, the product of the total load power and the weight of that DC-DC converter is taken as the target power of the DC-DC converter.

[0107] It should be noted that if the predicted output power of each DC-DC converter is greater than or equal to its own load power, it means that no DC-DC converter will malfunction, and there is no need to adjust the output power of the DC-DC converter, that is, there is no need to control the power supply of the vehicle.

[0108] S203: For each DC-DC converter, control the operation of the DC-DC converter according to the target power of the DC-DC converter.

[0109] In this step, after the controller obtains the target power of each DC-DC converter, it controls the operation of each DC-DC converter according to the target power, that is, it controls the output power of the DC-DC converter to be adjusted to the target power.

[0110] In one implementation, the DC-DC converter is controlled to operate based on a preset current change rate and the target power of the converter. This means adjusting the converter's output power to the target power by regulating the current. The current is increased or decreased according to a preset current change rate until the output power reaches the target. Adjusting the power using a preset current change rate avoids sudden power fluctuations, thus improving vehicle stability and safety.

[0111] It should be noted that the preset current change rate can be 10A / s, 20A / s, 50A / s, 70A / s, 100A / s, etc. This application embodiment does not limit the preset current change rate, which can be determined according to the actual situation.

[0112] It should be noted that after the controller controls the DC-DC converter to operate according to the target power, if it detects an abnormal power change in at least one DC-DC converter, for each DC-DC converter, it controls the operation of that DC-DC converter based on the current output power in its operating parameters and outputs an alarm message. In other words, it reverts the output power of the DC-DC converter to the power before adjustment, thereby improving vehicle safety.

[0113] Abnormal power variation of a DC-DC converter refers to the inability of the DC-DC converter's output power to be adjusted to the target power within a preset adjustment time. The preset adjustment time can be 30 seconds, 1 minute, 5 minutes, etc. This application embodiment does not limit the preset adjustment time and can determine it according to the actual situation.

[0114] The vehicle power supply control method provided in this embodiment calculates the predicted output power and thermal derating probability of each DC-DC converter based on the obtained operating parameters of the DC-DC converters in each power supply branch. If the predicted output power of at least one DC-DC converter is less than its load power, a target power for each DC-DC converter is calculated based on its predicted output power, thermal derating probability, preset priority factor, and load power. Finally, the operation of the DC-DC converters is controlled according to their target power. Compared to existing technologies that cannot adjust the output power of DC-DC converters, this solution readjusts the power of the DC-DC converters when their predicted output power is less than the load power, i.e., when an impending malfunction is predicted, thus avoiding damage to the DC-DC converters and improving their safety. Furthermore, adjusting the power of the DC-DC converters based on load power ensures sufficient power supply to loads simultaneously connected to multiple power supply branches. This solution also eliminates the need for additional equipment, reducing costs.

[0115] Figure 3 This is a flowchart illustrating a second embodiment of the vehicle power supply control method provided in this application. Based on the above embodiments, this application describes the process of determining whether readjustment is needed after adjusting the power of the DC-DC converter. For example... Figure 3 As shown, the power supply control method for this vehicle specifically includes the following steps:

[0116] S301: The DC-DC converter whose predicted output power is less than the load power is used as the target converter.

[0117] In this step, after the controller adjusts the output power of the DC-DC converter, in order to determine whether there is any abnormality in the adjusted power supply branch, it is necessary to first use the DC-DC converter with the predicted output power less than the load power as the target converter.

[0118] S302: Reacquire the operating parameters of the DC-DC converter in each power supply branch.

[0119] In this step, the controller also needs to reacquire the operating parameters of the DC-DC converters in each power supply branch.

[0120] It should be noted that the execution order of steps S301 and S302 can be: step S301 is executed first, then step S302; step S302 is executed first, then step S301; or steps S301 and S302 are executed simultaneously. This embodiment does not limit the execution order of steps S301 and S302, and it can be determined according to the actual situation.

[0121] S303: Determine the bus voltage deviation of each DC-DC converter based on the operating parameters of each DC-DC converter and the reacquired operating parameters.

[0122] In this step, after the controller reacquires the operating parameters, it determines the bus voltage deviation of each DC-DC converter based on the operating parameters of each DC-DC converter and the reacquired operating parameters.

[0123] Operating parameters include the bus voltage of the DC-DC converter. For each DC-DC converter, the difference between the bus voltage of that DC-DC converter and the reacquired bus voltage is divided by the bus voltage of that DC-DC converter to obtain the bus voltage deviation of that DC-DC converter.

[0124] S304: Determine the temperature rise rate difference for each target converter based on the operating parameters of each target converter and the reacquired operating parameters.

[0125] In this step, after the controller reacquires the operating parameters, it determines the temperature rise rate difference of each target converter based on the operating parameters of each target converter and the reacquired operating parameters.

[0126] According to step S201 in Embodiment 1, the first temperature rise rate is calculated based on the operating parameters of the target converter; the second temperature rise rate is calculated based on the reacquired operating parameters of the target converter; and the temperature rise rate difference of the target converter is obtained by subtracting the second temperature rise rate from the first temperature rise rate.

[0127] It should be noted that the execution order of steps S303 and S304 can be: step S303 is executed first, then step S304; step S304 is executed first, then step S303; or steps S303 and S304 are executed simultaneously. This embodiment does not limit the execution order of steps S303 and S304, and it can be determined according to the actual situation.

[0128] S305: Determine whether there is a DC-DC converter bus voltage deviation outside the preset deviation range, whether there is a target converter temperature rise rate difference greater than 0, and whether a load in the power supply branch is detected to have reset or power failure; if there is a DC-DC converter bus voltage deviation outside the preset deviation range, a target converter temperature rise rate difference greater than 0, or a load in the power supply branch is detected to have reset or power failure, then execute steps S306-S308; if the bus voltage deviation of each DC-DC converter is within the preset deviation range, the temperature rise rate difference of each target converter is less than or equal to 0, and no load in the power supply branch is detected to have reset or power failure, then execute step S309.

[0129] In this step, after the controller obtains the bus voltage deviation of each DC-DC converter and the temperature rise rate difference of each target converter, in order to determine whether there is an abnormality in the power supply branch, it is necessary to determine whether there is a DC-DC converter bus voltage deviation that is not within the preset deviation range, whether there is a target converter temperature rise rate difference greater than 0, and whether the load in the power supply branch is detected to have reset or power failure.

[0130] It should be noted that when a load in the power supply branch resets, it sends a reset signal to the controller; when a power failure occurs, it sends a power failure signal to the controller. Therefore, the controller can monitor whether a load in the power supply branch has reset or lost power.

[0131] It should be noted that the preset deviation range can be -3%~3%, -2%~2%, -1%~1%, etc. The embodiments of this application do not limit the preset deviation range, which can be determined according to the actual situation.

[0132] S306: Based on the reacquired operating parameters of each DC-DC converter, calculate the new predicted output power and the new thermal derating probability for each DC-DC converter.

[0133] S307: Calculate the new target power for each DC-DC converter based on the new predicted output power, new thermal derating probability, preset priority factor, and load power.

[0134] S308: For each DC-DC converter, control the operation of the DC-DC converter according to the new target power of the DC-DC converter, and return to the execution step S301.

[0135] In the above steps, if the controller determines that the bus voltage deviation of the DC-DC converter is not within the preset deviation range, the temperature rise rate difference of the target converter is greater than 0, or the load in the power supply branch is reset or loses power, it indicates that the bus voltage of the DC-DC converter is changing too much, or the target converter may experience thermal derating after adjustment, or the load power supply is insufficient. All of these indicate that there is an abnormality in the power supply branch, and the output power of the DC-DC converter needs to be readjusted.

[0136] Based on the reacquired operating parameters of each DC-DC converter, calculate the new predicted output power and the new thermal derating probability for each DC-DC converter.

[0137] Calculate the new target power for each DC-DC converter based on the new predicted output power, new thermal derating probability, preset priority factor, and load power.

[0138] For each DC-DC converter, control the operation of the DC-DC converter according to the new target power of the DC-DC converter. Then return to the execution step S301.

[0139] That is, repeat the above steps until the bus voltage deviation of each DC-DC converter is within the preset deviation range, the temperature rise rate difference of each target converter is less than or equal to 0, and no load reset or power failure is detected in the power supply branch, then the power supply control ends.

[0140] It should be noted that the implementation process of steps S306-S308 is similar to that of steps S201-S203 in Embodiment 1, and will not be described again here.

[0141] S309: End power supply control.

[0142] In this step, if the controller determines that the bus voltage deviation of each DC-DC converter is within the preset deviation range, the temperature rise rate difference of each target converter is less than or equal to 0, and no load reset or power failure is detected in the power supply branch, it indicates that no abnormal situation will occur in each power supply branch, and the power supply control will end.

[0143] The vehicle power supply control method provided in this embodiment improves vehicle power supply safety by readjusting the output power of the DC-DC converter when there is a bus voltage deviation of the DC-DC converter that is not within the preset deviation range, a temperature rise rate difference of the target converter that is greater than 0, or when the load in the power supply branch is detected to have reset or lost power.

[0144] The following are embodiments of the apparatus described in this application, which can be used to execute the embodiments of the method described in this application. For details not disclosed in the apparatus embodiments of this application, please refer to the embodiments of the method described in this application.

[0145] Figure 4 This is a schematic diagram of an embodiment of the vehicle power supply control device provided in this application; the device can be integrated into the controller in the above method embodiments, or it can be implemented through the controller in the above method embodiments. Figure 4 As shown, the vehicle's power supply control device 40 includes:

[0146] Processing module 41 is used for:

[0147] Based on the operating parameters of the DC-DC converters in each power supply branch, calculate the predicted output power and thermal derating probability of each DC-DC converter;

[0148] If the predicted output power of at least one DC-DC converter is less than the load power of the DC-DC converter, then the target power of each DC-DC converter is calculated based on the predicted output power, thermal derating probability, preset priority factor and load power of each DC-DC converter.

[0149] The control module 42 is used to control the operation of each DC-DC converter according to the target power of the DC-DC converter.

[0150] Furthermore, the operating parameters of each DC-DC converter include: the current temperature, the current output power, and the temperature at a preset number of previous times; the processing module 41 is specifically used for:

[0151] The predicted temperature of each DC-DC converter is determined based on the current temperature of each DC-DC converter and the temperature of a preset number of times prior to the current temperature.

[0152] The predicted output power of each DC-DC converter is determined based on the preset temperature threshold, the predicted temperature of each DC-DC converter, the output power at the current moment, and the preset thermal derating curve.

[0153] The thermal derating probability of each DC-DC converter is determined based on the preset temperature threshold, the preset safe temperature, and the predicted temperature of each DC-DC converter. The preset safe temperature is less than the preset temperature threshold.

[0154] Furthermore, processing module 41 is specifically used for:

[0155] For each DC-DC converter, if the predicted temperature of the DC-DC converter is less than or equal to a preset temperature threshold, then the current output power of the DC-DC converter is used as the predicted output power of the DC-DC converter.

[0156] For each DC-DC converter, if the predicted temperature of the DC-DC converter is greater than the preset temperature threshold, the smaller value between the thermal derating power of the DC-DC converter and the current output power is taken as the predicted output power of the DC-DC converter; the thermal derating power of the DC-DC converter is the power corresponding to the predicted temperature of the DC-DC converter in the preset thermal derating curve.

[0157] Furthermore, processing module 41 is specifically used for:

[0158] For each DC-DC converter, if the predicted temperature of the DC-DC converter is less than or equal to the preset safe temperature, then the thermal derating probability of the DC-DC converter is determined to be 0.

[0159] For each DC-DC converter, if the predicted temperature of the DC-DC converter is greater than or equal to the preset temperature threshold, then the thermal derating probability of the DC-DC converter is determined to be 1.

[0160] For each DC-DC converter, if the predicted temperature of the DC-DC converter is greater than the preset safe temperature and less than the preset temperature threshold, then the difference between the predicted temperature and the preset safe temperature of the DC-DC converter is divided by the difference between the preset temperature threshold and the preset safe temperature to obtain the thermal derating probability of the DC-DC converter.

[0161] Furthermore, processing module 41 is specifically used for:

[0162] For each DC-DC converter, the power supply capability parameters of the DC-DC converter are calculated based on the predicted output power, thermal derating probability, and preset priority factor.

[0163] The power supply capability parameters of each DC-DC converter are normalized to obtain the weight of each DC-DC converter;

[0164] The sum of the load power of all DC-DC converters is taken as the total load power;

[0165] For each DC-DC converter, the target power of the DC-DC converter is the product of the total load power and the weight of the DC-DC converter.

[0166] Furthermore, processing module 41 is specifically used for:

[0167] The difference between 1 and the thermal derating probability of the DC-DC converter is used as the thermal derating correction factor for the DC-DC converter.

[0168] The product of the predicted output power of the DC-DC converter, the thermal derating correction factor, and the preset priority factor is used as the power supply capability parameter of the DC-DC converter.

[0169] Furthermore, the control module 42 is specifically used for:

[0170] The operation of the DC-DC converter is controlled based on the preset current change rate and the target power of the DC-DC converter.

[0171] Furthermore, the control module 42 is also used for:

[0172] When an abnormal power change is detected in at least one DC-DC converter, for each DC-DC converter, the operation of the DC-DC converter is controlled according to the current output power in the operating parameters of the DC-DC converter, and an alarm message is output.

[0173] Furthermore, processing module 41 is also used for:

[0174] The DC-DC converter whose predicted output power is less than the load power is used as the target converter;

[0175] Reacquire the operating parameters of the DC-DC converter in each power supply branch;

[0176] The bus voltage deviation of each DC-DC converter is determined based on the operating parameters of each DC-DC converter and the reacquired operating parameters.

[0177] The temperature rise rate difference for each target converter is determined based on the operating parameters of each target converter and the reacquired operating parameters.

[0178] If the bus voltage deviation of a DC-DC converter is not within the preset deviation range, the temperature rise rate difference of the target converter is greater than 0, or the load in the power supply branch is detected to have reset or power failure, then based on the reacquired operating parameters of each DC-DC converter, the new predicted output power and new thermal derating probability of each DC-DC converter are calculated.

[0179] Calculate the new target power for each DC-DC converter based on the new predicted output power, new thermal derating probability, preset priority factor, and load power.

[0180] The control module 42 controls the operation of each DC-DC converter according to the new target power of the DC-DC converter.

[0181] Repeat the above steps until the bus voltage deviation of each DC-DC converter is within the preset deviation range, the temperature rise rate difference of each target converter is less than or equal to 0, and no load reset or power failure is detected in the power supply branch, then end the power supply control.

[0182] The vehicle power supply control device provided in this embodiment is used to execute the technical solution of the controller in any of the aforementioned method embodiments. Its implementation principle and technical effect are similar, and will not be described again here.

[0183] Figure 5 This is a schematic diagram of the structure of a controller provided in this application. Figure 5 As shown, the controller 50 includes:

[0184] Processor 51, memory 52, and communication interface 53;

[0185] Memory 52 is used to store executable instructions of processor 51;

[0186] The processor 51 is configured to execute the technical solution of the controller in any of the foregoing method embodiments by executing executable instructions.

[0187] Optionally, the memory 52 can be either standalone or integrated with the processor 51.

[0188] Optionally, when the memory 52 is a device independent of the processor 51, the controller 50 may further include:

[0189] Bus 54, memory 52 and communication interface 53 are connected to processor 51 through bus 54 and complete communication with each other. Communication interface 53 is used to communicate with other devices.

[0190] Optionally, the communication interface 53 can be implemented using a transceiver. The communication interface is used to enable communication between the database access device and other devices (e.g., clients, read-write databases, and read-only databases). The memory may include random access memory (RAM) and may also include non-volatile memory, such as at least one disk drive.

[0191] Bus 54 can be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. Buses can be categorized as address buses, data buses, control buses, etc. For ease of representation, only one thick line is used in the diagram, but this does not indicate that there is only one bus or one type of bus.

[0192] The processors mentioned above can be general-purpose processors, including central processing units (CPUs), network processors (NPs), etc.; they can also be digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components.

[0193] The controller is used to execute the technical solution of the controller in any of the aforementioned method embodiments. Its implementation principle and technical effect are similar, and will not be described again here.

[0194] This application also provides a computer program product, including a computer program, which, when executed by a processor, is used to implement the technical solutions provided in any of the foregoing method embodiments.

[0195] This application also provides a readable storage medium storing a computer program thereon, which, when executed by a processor, implements the technical solutions provided in any of the foregoing method embodiments.

[0196] This application also provides a vehicle, which includes a controller with multiple power supply branches.

[0197] Each power supply branch includes a DC-DC converter.

[0198] The controller is used to execute the technical solutions in any of the foregoing method embodiments. Its implementation principle and technical effect are similar, and will not be repeated here.

[0199] The aforementioned readable storage medium can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk. The readable storage medium can be any available medium accessible to a general-purpose or special-purpose computer.

[0200] An exemplary readable storage medium is coupled to a processor, enabling the processor to read information from and write information to the readable storage medium. Of course, the readable storage medium can also be a component of the processor. The processor and the readable storage medium can reside in an Application Specific Integrated Circuit (ASIC). Alternatively, the processor and the readable storage medium can exist as discrete components in the device.

[0201] The division of units is merely a logical functional division; in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be indirect coupling or communication connection through some interfaces, devices, or units, and may be electrical, mechanical, or other forms.

[0202] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0203] In addition, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0204] If a function is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this invention, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0205] Those skilled in the art will understand that all or part of the steps of the above-described method embodiments can be implemented by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When executed, the program performs the steps of the above-described method embodiments; and the aforementioned storage medium includes various media capable of storing program code, such as ROM, RAM, magnetic disks, or optical disks.

[0206] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A power supply control method of a vehicle, characterized by, The method, applied to a controller in a vehicle, includes: The predicted temperature of each DC-DC converter is determined based on the current temperature of the DC-DC converter in each power supply branch and the temperature of a preset number of times before the current time; each power supply branch is connected to the power battery in the vehicle, and the output lines of different power supply branches are not connected to each other. Based on the preset temperature threshold, the preset thermal derating curve, the predicted temperature of each DC-DC converter, and the current output power of each DC-DC converter, the predicted output power of each DC-DC converter is determined. Based on the preset temperature threshold, the preset safe temperature, and the predicted temperature of each DC-DC converter, the thermal derating probability of each DC-DC converter is determined, wherein the preset safe temperature is less than the preset temperature threshold. If the predicted output power of at least one DC-DC converter is less than the load power of the DC-DC converter, then for each DC-DC converter, the power supply capability parameter of the DC-DC converter is calculated based on the predicted output power, thermal derating probability and preset priority factor of the DC-DC converter. The power supply capability parameters of each DC-DC converter are normalized to obtain the weight of each DC-DC converter; The sum of the load power of all DC-DC converters is taken as the total load power; For each DC-DC converter, the product of the total load power and the weight of the DC-DC converter is used as the target power of the DC-DC converter; For each DC-DC converter, the operation of the DC-DC converter is controlled according to the target power of the DC-DC converter.

2. The method of claim 1, wherein, The step of determining the predicted output power of each DC-DC converter based on a preset temperature threshold, a preset thermal derating curve, the predicted temperature of each DC-DC converter, and the current output power of each DC-DC converter includes: For each DC-DC converter, if the predicted temperature of the DC-DC converter is less than or equal to the preset temperature threshold, then the current output power of the DC-DC converter is used as the predicted output power of the DC-DC converter. For each DC-DC converter, if the predicted temperature of the DC-DC converter is greater than the preset temperature threshold, then the smaller value between the thermal derating power of the DC-DC converter and the output power at the current moment is taken as the predicted output power of the DC-DC converter; the thermal derating power of the DC-DC converter is the power corresponding to the predicted temperature of the DC-DC converter in the preset thermal derating curve.

3. The method of claim 1, wherein, The step of determining the thermal derating probability of each DC-DC converter based on the preset temperature threshold, the preset safe temperature, and the predicted temperature of each DC-DC converter includes: For each DC-DC converter, if the predicted temperature of the DC-DC converter is less than or equal to the preset safe temperature, then the thermal derating probability of the DC-DC converter is determined to be 0. For each DC-DC converter, if the predicted temperature of the DC-DC converter is greater than or equal to the preset temperature threshold, then the thermal derating probability of the DC-DC converter is determined to be 1. For each DC-DC converter, if the predicted temperature of the DC-DC converter is greater than the preset safe temperature and less than the preset temperature threshold, then the difference between the predicted temperature and the preset safe temperature of the DC-DC converter is divided by the difference between the preset temperature threshold and the preset safe temperature to obtain the thermal derating probability of the DC-DC converter.

4. The method according to claim 1, characterized in that, The step of calculating the power supply capability parameters of the DC-DC converter based on the predicted output power, thermal derating probability, and preset priority factor of the DC-DC converter includes: The difference between 1 and the thermal derating probability of the DC-DC converter is used as the thermal derating correction factor of the DC-DC converter. The product of the predicted output power, thermal derating correction factor, and preset priority factor of the DC-DC converter is used as the power supply capability parameter of the DC-DC converter.

5. The method of claim 1, wherein, Controlling the operation of the DC-DC converter based on its target power includes: The operation of the DC-DC converter is controlled according to the preset current change rate and the target power of the DC-DC converter.

6. The method according to any one of claims 1 to 5, characterized in that, The method further includes: When an abnormal power change is detected in at least one DC-DC converter, for each DC-DC converter, the operation of the DC-DC converter is controlled according to the current output power in the operating parameters of the DC-DC converter, and an alarm message is output.

7. The method according to any one of claims 1 to 5, characterized in that, The method further includes: The DC-DC converter whose predicted output power is less than the load power is used as the target converter; Reacquire the operating parameters of the DC-DC converter in each power supply branch; The bus voltage deviation of each DC-DC converter is determined based on the operating parameters of each DC-DC converter and the reacquired operating parameters. The temperature rise rate difference for each target converter is determined based on the operating parameters of each target converter and the reacquired operating parameters. If the bus voltage deviation of a DC-DC converter is not within the preset deviation range, the temperature rise rate difference of the target converter is greater than 0, or the load in the power supply branch is detected to have reset or power failure, then based on the reacquired operating parameters of each DC-DC converter, the new predicted output power and new thermal derating probability of each DC-DC converter are calculated. Calculate the new target power for each DC-DC converter based on the new predicted output power, new thermal derating probability, preset priority factor, and load power. For each DC-DC converter, the operation of the DC-DC converter is controlled according to the new target power of the DC-DC converter; Repeat the above steps until the bus voltage deviation of each DC-DC converter is within the preset deviation range, the temperature rise rate difference of each target converter is less than or equal to 0, and no load reset or power failure is detected in the power supply branch, then end the power supply control.

8. A power supply control device of a vehicle characterized by comprising: include: Processing module, used for: The predicted temperature of each DC-DC converter is determined based on the current temperature of the DC-DC converter in each power supply branch and the temperature of a preset number of times before the current time; each power supply branch is connected to the power battery in the vehicle, and the output lines of different power supply branches are not connected to each other. Based on the preset temperature threshold, the preset thermal derating curve, the predicted temperature of each DC-DC converter, and the current output power of each DC-DC converter, the predicted output power of each DC-DC converter is determined. Based on the preset temperature threshold, the preset safe temperature, and the predicted temperature of each DC-DC converter, the thermal derating probability of each DC-DC converter is determined, wherein the preset safe temperature is less than the preset temperature threshold. If the predicted output power of at least one DC-DC converter is less than the load power of the DC-DC converter, then for each DC-DC converter, the power supply capability parameter of the DC-DC converter is calculated based on the predicted output power, thermal derating probability and preset priority factor of the DC-DC converter. The power supply capability parameters of each DC-DC converter are normalized to obtain the weight of each DC-DC converter; The sum of the load power of all DC-DC converters is taken as the total load power; For each DC-DC converter, the product of the total load power and the weight of the DC-DC converter is used as the target power of the DC-DC converter; A control module is used to control the operation of each DC-DC converter according to the target power of the DC-DC converter.

9. A controller characterized by comprising: include: Processor, memory, communication interface; The memory is used to store the executable instructions of the processor; The processor is configured to execute the power supply control method for the vehicle according to any one of claims 1 to 7 by executing the executable instructions.

10. A vehicle characterized by comprising: Includes the controller and multiple power supply branches; Each power supply branch includes a DC-DC converter; The controller is used to execute the power supply control method for the vehicle as described in any one of claims 1 to 7.

11. A readable storage medium, having stored thereon a computer program, characterized in that, When the computer program is executed by the processor, it implements the power supply control method for the vehicle according to any one of claims 1 to 7.

12. A computer program product, characterised in that, Includes a computer program, which, when executed by a processor, is used to implement the power supply control method for the vehicle according to any one of claims 1 to 7.

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